Utah announced on Monday that tailback Armand Shyne was lost for the rest of the season after suffering a non-contact knee injury on Saturday.

“He’s done for the year unfortunately, so we’re down to our sixth running back,” head coach Kyle Whittingham said at his weekly press conference. “You deal with it and move on. We’ll figure it out. Don’t have an answer for you right now but we’ll have one soon.”

The team’s leading rusher with 373 yards and four touchdowns on the season, Shyne went down in the fourth quarter last week after rushing for 101 yards and a touchdown in a 36-23 win over Pac-12 South rival Arizona. He is the fifth starter to go down for the Utes this year, joining centers Hiva Lutui and J.J. Dielman, tight end Siale Fakailoatonga and defensive end Kylie Fitts.

Complicating matters for the team is they are already extremely thin at running back. Backup Jordan Howard was also hurt late in the game against the Wildcats and will not be available this week against Oregon State.Joe Williams was supposed to be the starter this year but retired two weeks into the season to focus on school and junior Troy McCormick is still injured and won’t play. True freshman Zack Moss will be a game-time decision but is expected to start and redshirt freshman Marcel Manalo is all that’s left on the depth chart after that.

Utah is 5-1 heading into their game against the Beavers in Corvallis but getting a sixth win to keep pace in the standings of the Pac-12 South won’t be easy at all given how perilously thin the team is at tailback.